Automotive Manufacturing and the EV Transition

A car plant is among the most expensive single-product machines in industry. One assembly line costs roughly $1–3bn to build or retool and is designed for ~200,000–300,000 vehicles a year on two shifts. It pays for itself only when it runs near capacity, building a vehicle buyers will pay enough for. In 2025 the US market took ~16.3m new light vehicles (Cox Automotive/Kelley Blue Book count, reported), the best year since 2019, and Cox expected ~15.8m in 2026 (Dec 2025 forecast, reported). North American plants built ~15.2m light vehicles in 2025 (S&P Global Mobility forecast of Dec 2025, reported; final actuals verify). The bet of the decade went wrong for most incumbents. Between 2021 and 2023, the Detroit Three, Volkswagen, Stellantis and others committed tens of billions of dollars to battery-electric (BEV) platforms, dedicated plants and battery joint ventures, expecting EVs to take a large share of US sales by 2030. Instead, US EV share peaked above 10% in Q3 2025, as buyers rushed to beat the 30 Sep 2025 end of the federal consumer credit, and fell to ~6.5% in Q3 2026 (Kelley Blue Book, reported; equal to the Energy KB). Hybrids rose instead, to ~19.7% of sales in Q4 2025 on Cox's count and ~15.4% in H1 2026 on the Center for Automotive Research's (different bases, reported). The write-downs followed. Ford took ~$19.5bn of special-item charges (announced 15 Dec 2025) and ended battery-electric F-150 Lightning production. Stellantis took ~€22.2bn of H2 2025 charges (6 Feb 2026). GM recorded ~$7.6bn of EV-related charges in 2025 (reported, verify vs filings), idled Factory Zero in 2026 and moved Orion Assembly to petrol pickups and SUVs from early 2027 (reported). Meanwhile tariffs remade the cost of every imported car and part: Section 232 at 25% on vehicles from 3 Apr 2025 and on parts from 3 May 2025, with 15% deal rates for Japan and the EU. And BYD sold ~4.6m new-energy vehicles in 2025 and passed Tesla in battery-electric cars (Energy KB). This section explains the car plant from the factory floor: platforms, plants and the economics of a line; how the Detroit Three, the transplants and Europe's carmakers make money; the 2009 bankruptcies; the 2021–23 chip shortage; the EV bet and its 2025–26 reset; hybrids and extended-range EVs; China's cost lead; tariffs and rules of origin; and how an experienced operator thinks. A companion worked example computes the contribution per vehicle for an ICE, a BEV and an EREV, and the volume a dedicated EV line needs to cover its fixed cost.